drm/amdgpu: add the ring type definition of MES

Add a new ring type definition.

Signed-off-by: Jack Xiao <[e-mail]>
Acked-by: Alex Deucher <[e-mail]>
Reviewed-by: Hawking Zhang <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h

···
 	AMDGPU_RING_TYPE_VCN_DEC	= AMDGPU_HW_IP_VCN_DEC,
 	AMDGPU_RING_TYPE_VCN_ENC	= AMDGPU_HW_IP_VCN_ENC,
 	AMDGPU_RING_TYPE_VCN_JPEG	= AMDGPU_HW_IP_VCN_JPEG,
-	AMDGPU_RING_TYPE_KIQ
+	AMDGPU_RING_TYPE_KIQ,
+	AMDGPU_RING_TYPE_MES
 };
 
 enum amdgpu_ib_pool_type {